Do stop? no figures for that, but according to the link given by jobandknockoneout, there is at least one. Don't stop? well here's a link to a site you may deem acceptable for figures. Not knowing how big the craft are it is hard to put an exact number on it, but say on average a boat will hold 12, but they most likely overcrowd it, we'll say 25 per boat, and this year so far 13,000 (known) have come over, that works out at 520 they haven't stopped. But then you are probably aware that they are not really trying, but saying so will not suit your narrative, will it himmy?